Wahs pedals and filters can be funky, experimental, wild, and flat-out fun. One of the most interesting effects to be found on a board, these pedals do everything from emulating the warble of a human voice to pinpointing specific spectrum frequencies for completely new sounds. Used by legends from Jimi Hendrix to Bootsy Collins to Chet Atkins, the possibility for crafting a signature tone is just a sweep away.